US5593546A - Hybrid former with an MB unit in a paper machine - Google Patents

Hybrid former with an MB unit in a paper machine Download PDF

Info

Publication number
US5593546A
US5593546A US08/439,514 US43951495A US5593546A US 5593546 A US5593546 A US 5593546A US 43951495 A US43951495 A US 43951495A US 5593546 A US5593546 A US 5593546A
Authority
US
United States
Prior art keywords
wire
guide
draining
forming roll
forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/439,514
Other languages
English (en)
Inventor
Heikki Ilvespaa
Jyrki Jaakkola
Ari Linsuri
Erkki Partanen
Lauri Verkasalo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Valmet Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FI934999A priority Critical patent/FI100542B/sv
Priority to JP7135687A priority patent/JPH08302587A/ja
Application filed by Valmet Oy filed Critical Valmet Oy
Priority to US08/439,514 priority patent/US5593546A/en
Priority to EP95850089A priority patent/EP0742314B1/en
Priority to CA002149172A priority patent/CA2149172C/en
Assigned to VALMET PAPER MACHINERY INC. reassignment VALMET PAPER MACHINERY INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ILVESPAA, HEIKKI, JAAKKOLA, JYRKI, LINSURI, ARI, PARTANEN, ERKKI, VERKSALO, LAURI
Assigned to VALMET CORPORATION reassignment VALMET CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: VALMET PAPER MACHINERY, INC.
Application granted granted Critical
Publication of US5593546A publication Critical patent/US5593546A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the present invention relates to a hybrid former in a paper machine which comprises a lower-wire loop in which there is an initial single-wire portion of a forming zone including draining elements and wire-guide and draining elements arranged after the draining elements inside the lower-wire loop, and an upper-wire unit in which there is an upper wire which is guided by guide rolls and a breast roll onto the pulp layer that is formed on the initial single-wire portion of the lower wire.
  • a draining and forming unit which comprises at least one pressure-loaded press unit and a draining-chamber and at least one support unit which units are placed in opposite wire loops.
  • the support unit(s) there are sets of ribs which can be loaded against each other by applying pressure.
  • the forming members include various forming shoes which are usually provided with a curved ribbed deck and over which the forming wires placed one above the other and the web placed between the wires are curved. In the area of these forming shoes, water is drained through the wire placed at the side of the outside curve because of its tensioning pressure, and this draining is aided further by a field of centrifugal force.
  • Water is also drained through the wire placed at the side of the inside curve, which draining is typically intensified by means of a vacuum present in the chamber of the forming shoe.
  • the ribbed deck of the forming shoe produces pressure pulsation which both promotes the draining and improves the formation of the web.
  • MB units are known, through which two opposite wires run generally in a straight run.
  • a pressure loading unit inside the loop of one of the wires, there is a pressure loading unit, and inside the loop of the other wire, a draining unit is arranged including a set of guide and draining ribs.
  • the MB unit is placed in the fourdrinier wire portion so that the MB unit is preceded by a single-wire portion of considerable length in which a substantial amount of draining takes place before the web runs as a straight run, in the plane of the fourdrinier wire, through the MB unit.
  • the inlet geometry of the initial portion of the twin-wire forming zone has proved a highly critical point in the use of MB forming units.
  • the static forming shoes employed inside the lower-wire loop may cause instability in the running of the wires and, as a result, streaks in the finished paper are produced.
  • the initial portion of the twin-wire zone in the MB unit has a substantial effect, e.g., on the porosity of paper.
  • the inlet area of the twin-wire zone is problematic in particular because at this point, when the upper wire reaches contact with the top face of the pulp web that is being formed, the fiber structure of the pulp web "freezes", whereby the unevenness present in this area on the top face of the pulp layer is seen as streaks in the finished paper.
  • the pressure pulses of the static forming shoe produce wave formation in the top face of the web, which waves, having "frozen” in their position, are seen as these streaks.
  • Further drawbacks of the static and stationary forming shoes are their quite high friction as well as the wire-wearing effect.
  • a revolving guide and forming roll is arranged which is in tangential contact with the lower wire or curves the twin-wire zone at a small angle a, which angle is selected in the range of from about 0° to about 5°.
  • the guide and forming roll is in tangential contact with the lower wire.
  • the guide and forming roll is substantially immediately followed by the draining and forming unit which comprises sets of ribs and in whose area water is drained primarily through the upper wire while aided by the negative pressures present in the draining chamber or chambers in the unit.
  • the area of the inlet gap of the twin-wire zone can be made more stable so that neither harmful wave formation occurs in this zone nor resulting streaks are present in the finished paper.
  • the forming roll guides the lower wire also in the cross direction in a more stable way than the corresponding prior art stationary forming shoe does.
  • water is drained through the lower wire merely by the table-roll effect in itself known.
  • the covering angle a on the forming roll that curves the lower wire is typically in a range of from about 0° to about 5°, preferably in a range of from about 0° to about 2°, for it is possible to stabilize the run of the lower wire even with very small curve angles of the wire.
  • the forming roll may either be smooth-faced or have an open hollow face.
  • an open roll face it is favorably possible to employ a covering angle a that is, on the average, slightly larger.
  • a revolving forming roll that is arranged in accordance with the invention is preferable to a corresponding static forming shoe that rubs against the wire, and does not move, also in the respect that between the revolving face of the forming roll and the inner face of the lower wire, no abrasion is formed that consumes energy and abrades the faces.
  • the constant rotational movement of the forming roll eliminates frictional contact between a stationary curved ribbed deck and the wire.
  • the stock web is subjected to the dewatering taking place by means of the suction boxes in the MB unit while still as wet as possible, so that a maximum proportion of water is removed upward through the upper wire, the objective being to provide the web with a distribution of fines and fillers as symmetric as possible.
  • the inlet consistency k 1 of the stock web at the twin-wire zone has been arranged to be in the range of from about 1 to about 3% preferably from about 1.5 to about 2.5%, in which case the proportion of draining taking place through the upper wire can be made sufficiently high in view of the objectives described above.
  • the consistency of the stock web is of an order of k 2 from about 14% to about 19%, depending on the paper grade.
  • the roll diameter of the forming roll Do at the inlet of the twin-wire zone is, for example, with a machine of a width of 10 meters, from about 800 mm to about 1000 mm, in which case a sufficiently small deflection is provided for the roll.
  • the diameter of the roll can be considerably smaller than the example provided above, the diameter being typically from about 400 mm to about 500 mm.
  • FIG. 1 is a schematic side view of an overall concept of a hybrid former in accordance with the invention.
  • FIG. 1A is an axial cross-sectional view of the guide and forming roll used in accordance with the invention.
  • FIG. 1B is a sectional view taken along the line 1B--1B in FIG. 1A.
  • FIG. 2 is a central vertical sectional view in the machine direction of the initial part of the twin-wire zone and of the MB unit in a former in accordance with the invention.
  • FIG. 2A is a vertical sectional view in the machine direction of the detail DET bordered by the dashed line in FIG. 2.
  • FIG. 1 shows a hybrid former having the basic construction of a former marketed by the assignee with the trademark "Sym-Former".
  • the former as shown in FIG. 1 is also suitable for modernizations of fourdrinier wire parts in which case a loop of a lower wire 10 with its frame 50 consists of the existing construction, and the existing fourdrinier wire part has been modernized by means of a new upper-wire unit constructed on support of a frame part 60.
  • the former shown in FIG. 1 may also be a new construction.
  • the lower wire 10 is guided in its loop by guide rolls 11, and a pulp suspension jet J is fed through a slice part 32 of the headbox to the location of a breast roll 11a to the beginning of a horizontal fourdrinier wire portion 10a to form a web W 0 thereon.
  • draining elements 12 in themselves known situated in the wire portion 10a.
  • the twin-wire zone which is defined between the lower wire 10 and an upper wire 20, starts after the initial single-wire portion 10a at a breast roll 21a having a smooth-face 21a' which is situated in the loop of the upper wire.
  • a guide and forming roll 13 is arranged inside the loop of the lower wire 10 after the twin-wire zone has started and in the following, for the sake of conciseness, is designated simply as a "forming roll".
  • the forming roll 13 is followed by an MB unit 100 in which there is a pressure loading unit 14 inside the loop of the lower wire 10 and a suction-deflector chamber 22A and a draining chamber 22B subjected to a vacuum, which are arranged inside the loop of the upper wire 20.
  • a set of support ribs 28 is arranged against which ribs the twin-wire zone is pressed by a set of loading ribs 33 arranged in the pressure loading unit 14.
  • a forming roll 29 having a smooth-face 29' is arranged inside the upper-wire loop and curves the twin-wire zone is curved from a downward, inclined run before forming roll 29 to an upward, inclined run after forming roll 29.
  • a forming shoe 15 which has a ribbed deck 15' having a large curve radius.
  • the forming shoe 15 is connected to a vacuum, e.g., by means of suction legs 15a.
  • the forming shoe 15 is followed by a forming roll 16 having a smooth-face 16' arranged inside the loop of the lower wire 10 and which serves to alter the direction of the twin-wire zone from its upward, inclined run to a downward, inclined run.
  • the twin-wire zone continues in a downward, inclined zone in which, inside the loop of the lower wire 10, there are suction boxes 17.
  • the upper wire 20 is guided by a guide roll 21b to be separated from the paper web W.
  • the web W is separated from the lower wire at a pickup point P situated between rolls 18 and 19 and is transferred, with the aid of a suction zone 31a of a pick-up roll 31, onto a pick-up fabric 30 which carries the web W to the press section (not shown).
  • a preferred MB unit 100 which is shown in FIGS. 2 and 2A, comprises a set of dewatering chambers 22 whose front side is connected with a suction-deflector unit 22A in which there is a preliminary dewatering chamber 22a. From this preliminary chamber 22a, a draining duct 23a is passed to the wire pit at the driving side of the machine. A suction-deflector duct 25a is passed to the preliminary chamber 22a. Through the duct 25a, a substantial amount of water is removed in the direction of the arrow F a , aided by the compression between the wires 10,20 and by negative pressure P a present in the preliminary chamber 22a as well as by the effect of the kinetic energy of the water.
  • the set of dewatering chambers 22 has been divided into three separate compartments 22b, 22c and 22d by means of vertical partition walls.
  • the set of chambers 22 has outer walls in the cross direction and end walls in the machine direction.
  • the end walls at the driving side of the machine are connected with the water drain ducts 23b, 23c and 23d.
  • the compartments 22b, 22c and 22d are defined from below by the walls 29.
  • the loading unit 14 of the MB unit 100 operates on a frame part 37 of the loading unit 14, loading ribs 33 are supported by the intermediate of pressure hoses 39 and are interconnected in pairs by means of intermediate parts 35.
  • the pressure hoses 39 operate in pairs in the spaces between support parts 34 and 36.
  • the outside support parts 36 are fixed to the frame constructions 37 of the unit 14.
  • the first pair of ribs in the set of loading ribs 33 is denoted by reference numeral 33a, and the last rib is denoted by reference numeral 33b.
  • the support ribs 28 and the loading ribs 33a,33, 33b are arranged alternatingly against one another (not directly opposite to one another) to extend across the entire width of the wires 10,20 in the cross direction.
  • the set of loading ribs 33 is loaded against the inner face of the lower wire 20 by means of separately adjustable pressures P k of a pressure medium passed into the hoses 39.
  • the twin-wire zone runs in a gentle wave-like path guided by and between the sets of ribs 28 and 33a,33,33b preferably with a large curve radius R 0 or even substantially straight.
  • the curve radius R 0 is selected preferably in the range of from about 5 m to about 8 m.
  • the curve form R 0 of the twin-wire zone promotes the stable run of this zone.
  • Each of the compartments 22a,22b,22c and 22d communicates through a respective duct 24a,24b,24c,24d with a vacuum source, such as a suction pump, so that the level of the negative pressure P a ,P b ,P c ,P d present in each compartment 22a,22b,22c,22d can be independently regulated, or at least provided with a basic setting.
  • a vacuum source such as a suction pump
  • the negative pressures P a , . . . , P d are selected or set in a range from about 5 kPa to about 15 kPa.
  • the lower wire 10 is pressed both against the web W and against the upper wire 20 supported by the support ribs 28. This pressing contributes to dewatering of the web through both of the wires 10,20, but primarily through the upper wire 20 and is enhanced by the negative pressures P a ,P b ,P c ,P d .
  • a water flow F a enters from the space 26a below the compartment 22a through the duct 25a into the first compartment 22a in which the level of negative pressure P a is present.
  • a water flow F c enters through the duct 25b into the second compartment 22b.
  • a water flow F c is passed through the duct 25c into the compartment 22c.
  • a water flow F d is passed through the duct 25d into the compartment 22d.
  • a forming roll 13 is arranged inside the lower-wire loop and has a hollow face 13' or a corresponding smooth face.
  • pressure-loaded glide shoes 13Z are arranged inside the forming roll 13 and regulate the deflection of the mantle of the roll 13.
  • the glides shoes 13Z extend in the axial direction of the forming roll 13, i.e., glide shoes 13Z, . . . , 13Z n as shown in FIG.
  • the roll 13 has a deflectable mantle 121 which revolves about a roll core 100 as is conventional in the art, whereby the pressure-loaded glide shoes 13Z constitutes means for varying and regulating the deflection of the mantle 121.
  • its diameter D 0 is typically in the range of from about 400 mm to about 500 mm.
  • the forming roll 13 it is also possible to use a roll that has no crown variation, either a hollow-faced or a solid-faced roll, in which case, for example, in a machine of a width of 10 meters, D 0 would be from about 800 mm to about 1000 mm, so that the deflection of the forming roll 13 can be made sufficiently small.
  • the twin-wire zone has a very small curve sector a, which is selected in the range of from about 0° to about 5°, preferably from about 0° to about 2°. Even with a curve sector as small as this, sufficient transverse stabilization of the wires is achieved, but the sector a is so small that, in its area, no substantial dewatering takes place.
  • the forming roll 13 produces dewatering mainly by the so-called effect of a table roll because of the negative pressure formed in the wedge space R at its trailing side.
  • the fiber consistency k 1 of the stock layer W 0 is generally in the range from about 1% to about 3%, preferably in the range from about 1.5% to about 2.5%.
  • the fiber consistency k 2 of the stock layer is typically in the range from about 14% to about 19%, depending on the paper grade.
  • the stock web W 0 can be brought to the MB zone when sufficiently wet, such that, owing to the negative pressures P a , . . . , P d in the suction boxes 22, a sufficiently high dewatering through the upper wire 20 is achieved.
  • a substantially symmetric distribution of fillers and fines is formed in the paper.
  • the paper produced can also be made such that both of its faces are symmetric and of equal printing properties.
  • the length L of the MB zone calculated from the first support rib 33a to the last support rib 33c, is of an order of about 1.5 m.

Landscapes

  • Paper (AREA)
US08/439,514 1993-11-12 1995-05-11 Hybrid former with an MB unit in a paper machine Expired - Fee Related US5593546A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FI934999A FI100542B (sv) 1993-11-12 1993-11-12 Hybridformare med MB-enhet i en pappersmaskin
JP7135687A JPH08302587A (ja) 1993-11-12 1995-05-10 抄紙機におけるハイブリッドフォーマ
US08/439,514 US5593546A (en) 1993-11-12 1995-05-11 Hybrid former with an MB unit in a paper machine
EP95850089A EP0742314B1 (en) 1993-11-12 1995-05-11 Hybrid former with a MB unit in a paper machine
CA002149172A CA2149172C (en) 1993-11-12 1995-05-11 Hybrid former with an mb unit in a paper machine

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FI934999A FI100542B (sv) 1993-11-12 1993-11-12 Hybridformare med MB-enhet i en pappersmaskin
JP7135687A JPH08302587A (ja) 1993-11-12 1995-05-10 抄紙機におけるハイブリッドフォーマ
US08/439,514 US5593546A (en) 1993-11-12 1995-05-11 Hybrid former with an MB unit in a paper machine
EP95850089A EP0742314B1 (en) 1993-11-12 1995-05-11 Hybrid former with a MB unit in a paper machine
CA002149172A CA2149172C (en) 1993-11-12 1995-05-11 Hybrid former with an mb unit in a paper machine

Publications (1)

Publication Number Publication Date
US5593546A true US5593546A (en) 1997-01-14

Family

ID=27508573

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/439,514 Expired - Fee Related US5593546A (en) 1993-11-12 1995-05-11 Hybrid former with an MB unit in a paper machine

Country Status (5)

Country Link
US (1) US5593546A (sv)
EP (1) EP0742314B1 (sv)
JP (1) JPH08302587A (sv)
CA (1) CA2149172C (sv)
FI (1) FI100542B (sv)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068714A1 (en) * 2003-12-22 2005-07-28 Astenjohnson, Inc Gap type forming section for a two fabric paper making machine
WO2005068715A1 (en) * 2003-12-22 2005-07-28 Astenjohnson, Inc. Hybrid type forming section for a paper making machine
KR100825912B1 (ko) 2006-07-20 2008-04-28 아스텐존슨 인코포레이티드 제지기용의 2-직물 하이브리드(hybrid) 타입 성형부

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI105934B (sv) * 1994-06-17 2000-10-31 Valmet Paper Machinery Inc Ingång till en zon med dubbel vira i en hybridformare av en pappersmaskin
FI96623C (sv) 1994-08-31 1996-07-25 Valmet Paper Machinery Inc Formare med dubbel vira, speciellt för snabba pappersmaskiner
FI953984A (sv) * 1995-08-24 1997-02-25 Valmet Corp Banformningsparti i en pappersmaskin
CA2325855A1 (en) * 1997-03-31 1998-10-08 Beloit Technologies, Inc. Apparatus for removing fluid from a fibrous web
FI100667B (sv) * 1997-04-02 1998-01-30 Valmet Corp En vattenavlägsningsanordning för en former
FI109814B (sv) * 2001-11-23 2002-10-15 Vaahto Oy Anläggning för framställning av en pappers- eller kartongbana

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414061A (en) * 1975-02-20 1983-11-08 Australian Paper Manufacturers Limited Twin wire paper forming apparatus
US4557802A (en) * 1982-08-23 1985-12-10 A. Ahlstrom Osakeyhtio Apparatus for affecting a web drained on a wire
US4714521A (en) * 1984-11-15 1987-12-22 Mitsubishi Jukogyo Kabushiki Kaisha Twin wire former with an impermeable belt inside the top wire
FI893164A (fi) * 1987-10-30 1989-06-28 Escher Wyss Gmbh Dubbelviraformare.
FI885607A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Anordning foer styrning av viror i en pappersmaskins former.
FI905447A (fi) * 1990-11-02 1992-05-03 Valmet Karhula Inc Banformningsanordning.
EP0486814A1 (de) * 1990-11-20 1992-05-27 Voith Sulzer Papiermaschinen GmbH Nassteil einer Doppelsieb-Papiermaschine
US5185064A (en) * 1987-09-07 1993-02-09 Valmet-Ahlstrom Inc. Means for controlling wires in a paper machine or cardboard machine
US5215628A (en) * 1990-09-12 1993-06-01 Valmet Paper Machinery Inc. Twin-wire web former in a paper machine
WO1993012292A1 (de) * 1991-12-17 1993-06-24 J.M. Voith Gmbh Doppelsiebformer
EP0552139A1 (en) * 1992-01-17 1993-07-21 Valmet Paper Machinery Inc. Web former for a paper machine
FI924289A (fi) * 1992-09-24 1994-03-25 Valmet Paper Machinery Inc Foerfarande och anordning vid belastningen av zonen med dubbel vira i en formare av en pappermaskin
FI931951A (sv) * 1993-04-29 1994-10-30 Valmet Paper Machinery Inc System av avvattningskammare i en dubbelviraformare
FI932265A (sv) * 1993-05-18 1994-11-19 Valmet Paper Machinery Inc Banformningsparti i en pappersmaskin

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414061A (en) * 1975-02-20 1983-11-08 Australian Paper Manufacturers Limited Twin wire paper forming apparatus
US4557802A (en) * 1982-08-23 1985-12-10 A. Ahlstrom Osakeyhtio Apparatus for affecting a web drained on a wire
US4714521A (en) * 1984-11-15 1987-12-22 Mitsubishi Jukogyo Kabushiki Kaisha Twin wire former with an impermeable belt inside the top wire
US5185064A (en) * 1987-09-07 1993-02-09 Valmet-Ahlstrom Inc. Means for controlling wires in a paper machine or cardboard machine
FI893164A (fi) * 1987-10-30 1989-06-28 Escher Wyss Gmbh Dubbelviraformare.
FI885607A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Anordning foer styrning av viror i en pappersmaskins former.
US4988408A (en) * 1988-12-01 1991-01-29 Valmet-Ahlstrom Inc. Apparatus for guiding wires of a double wire former
US5215628A (en) * 1990-09-12 1993-06-01 Valmet Paper Machinery Inc. Twin-wire web former in a paper machine
FI905447A (fi) * 1990-11-02 1992-05-03 Valmet Karhula Inc Banformningsanordning.
EP0486814A1 (de) * 1990-11-20 1992-05-27 Voith Sulzer Papiermaschinen GmbH Nassteil einer Doppelsieb-Papiermaschine
US5282933A (en) * 1990-11-20 1994-02-01 Sulzer Escher Wyss Gmbh Wet section for a twin wire papermaking machine
WO1993012292A1 (de) * 1991-12-17 1993-06-24 J.M. Voith Gmbh Doppelsiebformer
EP0552139A1 (en) * 1992-01-17 1993-07-21 Valmet Paper Machinery Inc. Web former for a paper machine
US5395484A (en) * 1992-01-17 1995-03-07 Valmet Paper Machinery Inc. Twin wire web former for a paper machine
FI924289A (fi) * 1992-09-24 1994-03-25 Valmet Paper Machinery Inc Foerfarande och anordning vid belastningen av zonen med dubbel vira i en formare av en pappermaskin
FI931951A (sv) * 1993-04-29 1994-10-30 Valmet Paper Machinery Inc System av avvattningskammare i en dubbelviraformare
FI932265A (sv) * 1993-05-18 1994-11-19 Valmet Paper Machinery Inc Banformningsparti i en pappersmaskin
EP0627524A1 (en) * 1993-05-18 1994-12-07 Valmet Paper Machinery Inc. Web former in a paper machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068714A1 (en) * 2003-12-22 2005-07-28 Astenjohnson, Inc Gap type forming section for a two fabric paper making machine
WO2005068715A1 (en) * 2003-12-22 2005-07-28 Astenjohnson, Inc. Hybrid type forming section for a paper making machine
US20060175031A1 (en) * 2003-12-22 2006-08-10 Wildlong Vaughn Gap type forming section for a two fabric paper making machine
US20060283569A1 (en) * 2003-12-22 2006-12-21 Asten Johnson, Inc. Hybrid type forming section for a paper making machine
US7524402B2 (en) 2003-12-22 2009-04-28 Astenjohnson, Inc. Gap type forming section for a two fabric paper making machine
US7524401B2 (en) 2003-12-22 2009-04-28 Astenjohnson, Inc. Hybrid type forming section for a paper making machine
CN1886555B (zh) * 2003-12-22 2011-01-12 阿斯顿约翰逊公司 用于造纸机的混合型成形部
CN1886554B (zh) * 2003-12-22 2011-05-18 阿斯顿约翰逊公司 用于双织物造纸机的隙式成形部
KR100825912B1 (ko) 2006-07-20 2008-04-28 아스텐존슨 인코포레이티드 제지기용의 2-직물 하이브리드(hybrid) 타입 성형부

Also Published As

Publication number Publication date
FI934999A (sv) 1995-05-13
EP0742314A1 (en) 1996-11-13
FI934999A0 (fi) 1993-11-12
CA2149172C (en) 1999-02-16
JPH08302587A (ja) 1996-11-19
EP0742314B1 (en) 1999-03-24
CA2149172A1 (en) 1996-11-12
FI100542B (sv) 1997-12-31

Similar Documents

Publication Publication Date Title
US5074966A (en) Gap former in a paper machine
US5582687A (en) Web former for a paper machine
US4925531A (en) Twin wire former for a paper machine
EP0373133A2 (en) Method and device in the formation of a paper or board web
US5599427A (en) Twin-wire web former in a paper machine
EP0296135A2 (en) Hydrid former for a paper machine
CA2050844C (en) Twin-wire web former in a paper machine
US5593546A (en) Hybrid former with an MB unit in a paper machine
EP0699798A1 (en) Twin-wire former, in particular for high-speed paper machines
US5656133A (en) Hybrid former for a paper machine
US4923568A (en) Dewatering zone in a papermachine
US4919760A (en) Web former for a paper machine
EP0627524B1 (en) Web former in a paper machine
US5573643A (en) Twin wire web former in a paper machine
EP0627523A1 (en) Gap former in a paper machine
EP0712959B1 (en) Set of ribs in a dewatering device in a paper machine
EP0393656B1 (en) Assembly in a paper machine for effecting upward dewatering
JPS5942120B2 (ja) 抄紙機での２枚ワイヤ抄紙装置
WO1999060205A1 (en) Twin-wire roll-gap former in a paper machine
KR960037957A (ko) 제지기계 내의 mb 유닛을 가진 하이브리드 포머

Legal Events

Date Code Title Description
AS Assignment

Owner name: VALMET PAPER MACHINERY INC., FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ILVESPAA, HEIKKI;JAAKKOLA, JYRKI;LINSURI, ARI;AND OTHERS;REEL/FRAME:007548/0838

Effective date: 19950327

AS Assignment

Owner name: VALMET CORPORATION, FINLAND

Free format text: MERGER;ASSIGNOR:VALMET PAPER MACHINERY, INC.;REEL/FRAME:007884/0649

Effective date: 19950831

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
LAPS Lapse for failure to pay maintenance fees

Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20050114